Ariston ACO 27 RFFI Instructies voor installatie en onderhoud - Pagina 12

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ATER

REATMENT

The boiler is equipped with an aluminium alloy main heat

exchanger.

The detailed recommendations for water treatment are given in

BS 7593:1992 (Treatment of water in domestic hot water central

heating systems); the following notes are given for general

guidance:

- If the boiler is installed in an existing system, any

unsuitableadditives must be removed;

- Under no circumstances should the boiler be fired before

thesystem has been thoroughly flushed; the flushing

procedure must be in line with BS7593:1992.

We highly recommend the use of a flushing detergent

appropriate for the metals used in the aluminium alloy circuit.

These include (Fernox Superfloc, BetzDearborn Sentinel

X300 or X400 or Salamander System Cleanser), whose

function is to dissolve any foreign matter that may be in the

system;

In hard water areas or where large quantities of water are in

the system the treatment of the water to prevent premature

scaling of the main heat exchanger is necessary.

The formation of scale strongly compromises the efficiency of

the thermic exchange because small areas of scale cause a

high increase of the temperature of the metallic walls and

therefore add to the thermal stress of the heat exchanger.

Demineralized water is more aggressive so in this situation it

is necessary to treat the water with an appropriate corrosion

inhibitor.

- Any treatment of water by additives in the system for frost

protection or for corrosion inhibition has to be absolutely

suitable for all the metals used in the circuit including the

aluminium alloys.

The use of a corrosion inhibitor in the system such as Fernox

MB-1, BetzDeaborn Sentinel X100 or Copal Salamander

System Inhibitor is recommended to prevent corrosion

(sludge) damaging the boiler and systems;

- If anti-freeze substances are to be used in the system, check

carefully that they are compatible with the aluminium.

In particular, DO NOT USE ordinary ETHYLENE GLYCOL,

since it is corrosive in relation to aluminium and its alloy, as

well being toxic.

MTS suggests the use of suitable anti-freeze products such

as Fernox ALPHI 11, which will prevent rust and incrustation

taking place.

Periodically check the pH of the water/anti-freeze mixture of

the boiler circuit and replace it when the amount measured is

out of the range stipulated by the manufacturer ( 7 < pH < 8).

DO NOT MIX DIFFERENT TYPES OF ANTI-FREEZE

- In under-floor systems, the use of plastic pipes without

protection against penetration of oxygen through the walls

can cause corrosion of the system's metal parts ( metal

piping, boiler, etc), through the formation of oxides and

bacterial agents.

To prevent this problem, it is necessary to use pipes with an

"oxygen-proof barrier", in accordance with standards DIN

4726/4729. If pipes of this kind are not used, keep the

system separate byinstalling heat exchangers of those

with a specific system water treatment.

IMPORTANT

Failure to carry out the water treatment procedure

may invalidate the appliance warranty